Created
May 19, 2013 06:12
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<Page | |
x:Class="SpottedZebra.Examples.WinRT.SpritesheetExamplePage" | |
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" | |
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" | |
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" | |
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" | |
mc:Ignorable="d"> | |
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}"> | |
<Rectangle Width="100" Height="150"> | |
<Rectangle.Fill> | |
<ImageBrush ImageSource="/Images/OwlSpritesheet.png" | |
Stretch="None" | |
AlignmentX="Left" | |
AlignmentY="Top"> | |
<ImageBrush.Transform> | |
<TranslateTransform x:Name="SpriteSheetOffset" X="0" Y="0" /> | |
</ImageBrush.Transform> | |
</ImageBrush> | |
</Rectangle.Fill> | |
</Rectangle> | |
</Grid> | |
</Page> |
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namespace SpottedZebra.Examples.WinRT | |
{ | |
using System; | |
using Windows.UI.Xaml.Controls; | |
using Windows.UI.Xaml.Media; | |
using Windows.UI.Xaml.Navigation; | |
public sealed partial class SpritesheetExamplePage : Page | |
{ | |
private const int NumberOfColumns = 10; | |
private const int NumberOfFrames = 51; | |
private const int FrameWidth = 100; | |
private const int FrameHeight = 150; | |
public static readonly TimeSpan TimePerFrame = TimeSpan.FromSeconds(0.5); | |
private int currentFrame; | |
private TimeSpan timeTillNextFrame; | |
public SpritesheetExamplePage() | |
{ | |
this.InitializeComponent(); | |
} | |
protected override void OnNavigatedTo(NavigationEventArgs e) | |
{ | |
CompositionTarget.Rendering += this.OnUpdate; | |
} | |
protected override void OnNavigatedFrom(NavigationEventArgs e) | |
{ | |
CompositionTarget.Rendering -= this.OnUpdate; | |
} | |
private void OnUpdate(object sender, object e) | |
{ | |
this.timeTillNextFrame += TimeSpan.FromSeconds(1 / 60f); | |
if (this.timeTillNextFrame > TimePerFrame) | |
{ | |
this.currentFrame = (this.currentFrame + 1 + NumberOfFrames) % NumberOfFrames; | |
var column = this.currentFrame % NumberOfColumns; | |
var row = this.currentFrame / NumberOfColumns; | |
this.SpriteSheetOffset.X = -column * FrameWidth; | |
this.SpriteSheetOffset.Y = -row * FrameHeight; | |
} | |
} | |
} | |
} |
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Ok I've figured it out for anyone else who's struggling. You need to set the viewport of the imagebrush to the dimensions of your sprite - I presume WPF is cropping the image when loading it to optimise (if you are dynamically loading the image).